linux/zvol_os.c: Fix max_discard_sectors limit for 6.8+ kernel

In kernels 6.8 and later, the zvol block device is allocated with
qlimits passed during initialization. However, the zvol driver does not
set `max_hw_discard_sectors`, which is necessary to properly
initialize `max_discard_sectors`. This causes the `zvol_misc_trim` test
to fail on 6.8+ kernels when invoking the `blkdiscard` command. Setting
`max_hw_discard_sectors` in the `HAVE_BLK_ALLOC_DISK_2ARG` case resolve
the issue.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes openzfs#16462

module/os/linux/zfs/zvol_os.c

@@ -1213,6 +1213,7 @@ zvol_queue_limits_convert(zvol_queue_limits_t *limits,
 	qlimits->io_opt = limits->zql_io_opt;
 	qlimits->physical_block_size = limits->zql_physical_block_size;
 	qlimits->max_discard_sectors = limits->zql_max_discard_sectors;
+	qlimits->max_hw_discard_sectors = limits->zql_max_discard_sectors;
 	qlimits->discard_granularity = limits->zql_discard_granularity;
 #ifdef HAVE_BLKDEV_QUEUE_LIMITS_FEATURES
 	qlimits->features =